Chaotic Electromancer

Spellbind X (When Chaotic Electromancer enters the battlefield, exile up to one instant or sorcery with converted mana cost X or less from your hand.)
When Chaotic Electromancer leaves the battlefield, you may cast the bound spell without paying its mana cost. If you do, return it to
your hand.
{t}, {u/r}: Return Chaotic Electromancer to
your hand.